#region License
// Copyright 2008-2009 Jeremy Skinner (http://www.jeremyskinner.co.uk)
// 
// Licensed under the Apache License, Version 2.0 (the "License"); 
// you may not use this file except in compliance with the License. 
// You may obtain a copy of the License at 
// 
// http://www.apache.org/licenses/LICENSE-2.0 
// 
// Unless required by applicable law or agreed to in writing, software 
// distributed under the License is distributed on an "AS IS" BASIS, 
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
// See the License for the specific language governing permissions and 
// limitations under the License.
// 
// The latest version of this file can be found at http://www.codeplex.com/FluentValidation
#endregion

namespace FluentValidation.Attributes {
    using System;

    /// <summary>
    /// Implementation of IValidatorFactory that looks for [Validator] attributes on the specified type in order to provide the validator instance.
    /// Note that the validators are created by calling Activator.CreateInstance and the created validators are not cached, so there are potential performance implications using this approach.
    /// </summary>
    public class AttributedValidatorFactory : IValidatorFactory {
        #region IValidatorFactory Members
        public IValidator<T> GetValidator<T>() {
            return (IValidator<T>)GetValidator(typeof(T));
        }

        public virtual IValidator GetValidator(Type type) {
            if (type == null)
                return null;

            var attribute = (ValidatorAttribute)Attribute.GetCustomAttribute(type, typeof(ValidatorAttribute));

            if (attribute == null || attribute.ValidatorType == null)
                return null;

            return (IValidator)Activator.CreateInstance(attribute.ValidatorType);
        }
        #endregion
    }
}